328 Cc. W. MARSH. : 
Powder treated with cold HCl; only slightly attacked, solution - 
dark in colour. With hot HCl, partly decomposed, leaving grey 
residue; the cooling solution deposits white flocculent precipitate 
which is increased by the addition of water. 
Powder treated with H,SO, is partly soluble with violet fumes 
similar to the nitric acid reaction, only much denser. 
Powder treated with acid potassium sulphate in closed tube, 
fuses to a green mass with dense violet fumes, which turn starch ~ 
paper blue. 
[Mr. Marsh forwarded to mea small specimen of the copper 
iodide, and I have verified the principal characteristics as given 
in his description ; as the mineral appears to be a new one, I 
suggest that it be named Marshite, in recognition of Mr. Marsh’s 
discovery and the zeal and diligence which he has shown in collect- 
ing and describing the minerals of the Broken Hill district.—A 
Liversidge. | 
Additional notes on the mode of occurrence of Copper Iodide. 
The crystals of copper iodide from which the above examinations 
have been made, are in most cases implanted on what appears to 
have been similar crystals belonging to an earlier period of forma- 
tion, but which had already suffered partial decomposition. Their 
outer surfaces being changed to impure black oxide of copper—in 
some instances thickly coated with oxide of manganese—with a 
yellow resinous-like substance in the centre. These partly decom- 
posed crystals on account of the difficulty in getting a pure sample, 
have as yet only been tested for copper and iodine, for which they 
give reactions similar to the later formed unaltered ones. 
A third, and earlier date still, is traceable in the deposition of 
well formed crystals of anglesite, against the sides of which crystals 
of copper iodide, belonging to both the earlier and later formations 
are imposed. 
We have thus indirect evidence of three well marked stages of 
deposition, which appear to warrant the following conclusions :-— 
’ 
natn a i te te 
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